when the app is more fully featured and less buggy I'll submit it to hackernews. If you are interested in following the progress, email me (firstname.lastname@example.org). Thanks!
Bad marketing imho.
There are a lot more examples on http://popcornjs.org
Using Mozilla's Popcorn Maker webapp, anybody can make a similar project: http://mozillapopcorn.org/popcorn-maker/
PS: Popcorn looks really good!
Good to have. But for me not very practical. I think I have to rewatch the video to look at the comments/infos most of the time.